Stereoselective Conjugate Addition of Mixed Organoaluminum Reagents to α,β-Unsaturated<i>N</i>-Acyloxazolidinones Derived from Carbohydrates
作者:Horst Kunz、Stephan Elzner、Steffen Maas、Stefan Engel
DOI:10.1055/s-2004-831173
日期:——
β-branched carboxylic acid derivatives was accomplished by conjugate addition of mixed organoaluminum reagents to chiral α,β-unsaturated N-acyloxazolidinones. Mixed organoaluminum reagentswere generated in situ by transmetalation of Grignard or organolithium compounds with methylaluminum dichloride. Efficient stereocontrol was achieved using different bicyclic glycosamine-derived oxazolidinones, yielding
β-支化羧酸衍生物的立体选择性合成是通过将混合有机铝试剂与手性 α,β-不饱和 N-酰基恶唑烷酮共轭加成来完成的。混合有机铝试剂通过格氏试剂或有机锂化合物与二氯化甲基铝的金属转移原位生成。使用不同的双环糖胺衍生的恶唑烷酮实现了有效的立体控制,产生交替 (R)- 或 (S)- 配置的 β- 支化羧酸衍生物。